<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title>上传和下载的进度监控 | 知识库演示</title>
    <meta name="generator" content="VuePress 1.9.9">
    <link rel="icon" href="/vdoing-demo-repository/img/favicon.ico">
    <meta name="description" content="web前端技术博客,简洁至上,专注web前端学习与总结。JavaScript,js,ES6,TypeScript,vue,python,css3,html5,Node,git,github等技术文章。">
    <meta name="keywords" content="前端博客,个人技术博客,前端,前端开发,前端框架,web前端,前端面试题,技术文档,学习,面试,JavaScript,js,ES6,TypeScript,vue,python,css3,html5,Node,git,github,markdown">
    <meta name="theme-color" content="#11a8cd">
    
    <link rel="preload" href="/vdoing-demo-repository/assets/css/0.styles.bb913129.css" as="style"><link rel="preload" href="/vdoing-demo-repository/assets/js/app.52e6b5d0.js" as="script"><link rel="preload" href="/vdoing-demo-repository/assets/js/2.f10ddeba.js" as="script"><link rel="preload" href="/vdoing-demo-repository/assets/js/158.ad6e937f.js" as="script"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/10.82e086d6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/100.2570dab9.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/101.b429c13f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/102.0e9afba4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/103.42e8d9d6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/104.6ca089b8.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/105.f02335fc.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/106.2fe52c32.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/107.7650f18b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/108.7d825011.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/109.42092f8e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/11.49ec595f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/110.8e6f8d5b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/111.84bc1774.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/112.5da6cb16.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/113.2eb6714d.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/114.dbdf6a79.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/115.96dc61ac.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/116.2774e841.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/117.5a0ea935.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/118.72005b7a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/119.77fd4a33.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/12.66e2368f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/120.994b6190.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/121.794bec47.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/122.239044f6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/123.d6247b89.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/124.357cddf4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/125.b27c8c6b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/126.2f09d5b4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/127.5b5e7dcc.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/128.ca8342ed.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/129.62196c04.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/13.01d28bf6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/130.ae36e0a1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/131.63408c4f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/132.7a1bc472.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/133.6f365b21.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/134.7dfd70a1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/135.c110453c.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/136.dea9b77b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/137.212998a2.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/138.cf96d5b3.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/139.34437df0.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/14.52e25550.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/140.b28a1de4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/141.d117632d.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/142.743bfbfc.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/143.d6c926e2.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/144.86916e4e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/145.a4658544.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/146.9f190393.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/147.b53beefe.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/148.d49c882d.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/149.b5c8b142.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/15.ff9c9117.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/150.ab4902b7.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/151.aa13cf1a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/152.ca32ca39.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/153.f3dc7a9e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/154.2198d119.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/155.6cf21591.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/156.929b9e50.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/157.6d227e19.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/159.d74c55e1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/16.a59e9d0e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/160.1e9abdb1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/161.5343ce3e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/162.214b3f61.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/163.918d2361.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/164.204cab40.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/165.884ba632.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/166.e3bc3126.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/167.b8103188.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/168.176b21b8.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/169.56e67ae6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/17.73f27920.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/170.05fe9454.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/171.ac72af48.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/172.134bd8be.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/173.f7b83d9b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/174.bc7aa46f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/175.c654668c.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/176.33b09327.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/177.97d7e55f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/178.ab02c611.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/179.0d88c6f5.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/18.39e882fe.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/180.1a2df1f3.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/181.533495f7.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/182.a4fc6807.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/183.e3a44f30.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/184.b731d331.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/185.e6eb67ad.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/186.c2493cb4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/187.279befae.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/188.1de7c987.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/189.e748958a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/19.ef7490a3.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/190.ad045bc8.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/191.c3131762.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/192.29ea4e7e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/193.1e75aa14.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/194.f1150906.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/195.2a593c50.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/196.5aa5efe2.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/197.a328dc59.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/198.9db60424.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/199.d3b39a54.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/20.b5301937.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/200.a9dae555.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/21.2e9bd506.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/22.02e5e5a0.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/23.a00bf08d.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/24.dae9e7bf.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/25.3120ccd4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/26.628f5a86.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/27.d4e86439.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/28.642a9f76.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/29.6c013ead.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/3.c3e96c9f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/30.4e45e23b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/31.9b0c4fcb.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/32.347f1a82.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/33.a17e9f72.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/34.ae475141.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/35.70d7eb87.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/36.0166a619.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/37.8d63783a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/38.91c94a9e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/39.edf5fef6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/4.f05e47c1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/40.f2dfda35.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/41.488faa5e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/42.258fde58.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/43.c46a30da.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/44.cfac4a51.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/45.58439e5f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/46.91d42cf4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/47.39ec1b7a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/48.900b1d2a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/49.4db4a295.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/5.85821e9b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/50.4a48e245.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/51.32253e74.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/52.f9692c89.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/53.f93fad53.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/54.cccf7ffb.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/55.7e4f324a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/56.5d04b9d7.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/57.ed34f737.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/58.9e762eed.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/59.81cfbcc1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/6.5f8d8bd6.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/60.76f14de8.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/61.a4d207e0.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/62.fce4471e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/63.58fd2153.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/64.b3f081c8.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/65.dbde37b1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/66.49bc7970.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/67.48b689d5.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/68.a3660c81.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/69.b4057547.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/7.4acc3e20.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/70.5f3717cf.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/71.d47ff342.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/72.eca3c6ef.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/73.71bbaeec.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/74.6fe6e554.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/75.4dbad835.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/76.6ec52a3f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/77.9041350a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/78.e0b3aa97.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/79.1dbdb52c.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/8.503d9748.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/80.568b41f1.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/81.9394cc64.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/82.e36a0a2e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/83.fba15f4a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/84.1a6a64b4.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/85.af0f0d14.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/86.aed3f80d.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/87.08c34bee.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/88.52b2750e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/89.6d27f363.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/9.9691b37e.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/90.cccb0e61.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/91.6fb1e7f3.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/92.9e3d1d8a.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/93.25bb0c7b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/94.0a896da5.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/95.41991c9b.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/96.1f4103d8.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/97.97ec058f.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/98.f40afd31.js"><link rel="prefetch" href="/vdoing-demo-repository/assets/js/99.ac67e72d.js">
    <link rel="stylesheet" href="/vdoing-demo-repository/assets/css/0.styles.bb913129.css">
  </head>
  <body class="theme-mode-light">
    <div id="app" data-server-rendered="true"><div class="theme-container sidebar-open have-rightmenu"><header class="navbar blur"><div title="目录" class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/vdoing-demo-repository/" class="home-link router-link-active"><img src="/vdoing-demo-repository/img/EB-logo.png" alt="知识库演示" class="logo"> <span class="site-name can-hide">知识库演示</span></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><a href="/vdoing-demo-repository/" class="nav-link">首页</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Python" class="dropdown-title"><a href="/vdoing-demo-repository/python/" class="link-title">Python</a> <span class="title" style="display:none;">Python</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>Python</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/vdoing-demo-repository/pages/c438df/" class="nav-link">Python基础</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/vdoing-demo-repository/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/vdoing-demo-repository/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/pages/802a1ca6f7b71c59/" class="nav-link">Vue</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/javascript/" class="nav-link">《JavaScript教程》笔记</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/es6/" class="nav-link">《ES6 教程》笔记</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/vue/" class="nav-link">《Vue》笔记</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/wx-miniprogram/" class="nav-link">小程序笔记</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/vdoing-demo-repository/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/vdoing-demo-repository/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><a href="/vdoing-demo-repository/archives/" class="nav-link">归档</a></div> <a href="https://github.com/xugaoyi/vuepress-theme-vdoing" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <div class="sidebar-hover-trigger"></div> <aside class="sidebar" style="display:none;"><!----> <nav class="nav-links"><div class="nav-item"><a href="/vdoing-demo-repository/" class="nav-link">首页</a></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="Python" class="dropdown-title"><a href="/vdoing-demo-repository/python/" class="link-title">Python</a> <span class="title" style="display:none;">Python</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>Python</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/vdoing-demo-repository/pages/c438df/" class="nav-link">Python基础</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="前端" class="dropdown-title"><a href="/vdoing-demo-repository/web/" class="link-title">前端</a> <span class="title" style="display:none;">前端</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><h4>前端文章</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/vdoing-demo-repository/pages/8143cc480faf9a11/" class="nav-link">JavaScript</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/pages/802a1ca6f7b71c59/" class="nav-link">Vue</a></li></ul></li><li class="dropdown-item"><h4>学习笔记</h4> <ul class="dropdown-subitem-wrapper"><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/javascript/" class="nav-link">《JavaScript教程》笔记</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/es6/" class="nav-link">《ES6 教程》笔记</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/vue/" class="nav-link">《Vue》笔记</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/typescript-axios/" class="nav-link">《TypeScript 从零实现 axios》</a></li><li class="dropdown-subitem"><a href="/vdoing-demo-repository/note/wx-miniprogram/" class="nav-link">小程序笔记</a></li></ul></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="页面" class="dropdown-title"><a href="/vdoing-demo-repository/ui/" class="link-title">页面</a> <span class="title" style="display:none;">页面</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/8309a5b876fc95e3/" class="nav-link">HTML</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/0a83b083bdf257cb/" class="nav-link">CSS</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><button type="button" aria-label="技术" class="dropdown-title"><a href="/vdoing-demo-repository/technology/" class="link-title">技术</a> <span class="title" style="display:none;">技术</span> <span class="arrow right"></span></button> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/9a7ee40fc232253e/" class="nav-link">技术文档</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/4c778760be26d8b3/" class="nav-link">GitHub技巧</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/117708e0af7f0bd9/" class="nav-link">Nodejs</a></li><li class="dropdown-item"><!----> <a href="/vdoing-demo-repository/pages/41f87d890d0a02af/" class="nav-link">博客搭建</a></li></ul></div></div><div class="nav-item"><a href="/vdoing-demo-repository/archives/" class="nav-link">归档</a></div> <a href="https://github.com/xugaoyi/vuepress-theme-vdoing" target="_blank" rel="noopener noreferrer" class="repo-link">
    GitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>初识 TypeScript</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TypeScript 常用语法</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 项目初始化</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 基础功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 异常情况处理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 接口扩展</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 拦截器实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 配置化实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 取消功能实现</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>ts-axios 更多功能实现</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/vdoing-demo-repository/pages/5dce43eba796a2ab/" class="sidebar-link">withCredentials</a></li><li><a href="/vdoing-demo-repository/pages/390cb70e2b619449/" class="sidebar-link">XSRF 防御</a></li><li><a href="/vdoing-demo-repository/pages/1376fd897809036e/" aria-current="page" class="active sidebar-link">上传和下载的进度监控</a><ul class="sidebar-sub-headers"><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/1376fd897809036e/#需求分析" class="sidebar-link">需求分析</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/1376fd897809036e/#代码实现" class="sidebar-link">代码实现</a></li><li class="sidebar-sub-header level2"><a href="/vdoing-demo-repository/pages/1376fd897809036e/#demo-编写" class="sidebar-link">demo 编写</a></li></ul></li><li><a href="/vdoing-demo-repository/pages/89cd6496c23159ae/" class="sidebar-link">HTTP 授权</a></li><li><a href="/vdoing-demo-repository/pages/40b41ce8e8159567/" class="sidebar-link">自定义合法状态码</a></li><li><a href="/vdoing-demo-repository/pages/7753b8141663e54a/" class="sidebar-link">自定义参数序列化</a></li><li><a href="/vdoing-demo-repository/pages/0b9f2ee2b4dbb728/" class="sidebar-link">baseURL</a></li><li><a href="/vdoing-demo-repository/pages/c26b053540a7dafa/" class="sidebar-link">静态方法扩展</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 单元测试</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>ts-axios 部署与发布</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <div><main class="page"><div class="theme-vdoing-wrapper "><div class="articleInfo-wrap" data-v-06225672><div class="articleInfo" data-v-06225672><ul class="breadcrumbs" data-v-06225672><li data-v-06225672><a href="/vdoing-demo-repository/" title="首页" class="iconfont icon-home router-link-active" data-v-06225672></a></li> <li data-v-06225672><a href="/vdoing-demo-repository/note/typescript-axios/#《TypeScript 从零实现 axios》" data-v-06225672>《TypeScript 从零实现 axios》</a></li><li data-v-06225672><a href="/vdoing-demo-repository/note/typescript-axios/#ts-axios 更多功能实现" data-v-06225672>ts-axios 更多功能实现</a></li></ul> <div class="info" data-v-06225672><div title="作者" class="author iconfont icon-touxiang" data-v-06225672><a href="javascript:;" data-v-06225672>HuangYi</a></div> <div title="创建时间" class="date iconfont icon-riqi" data-v-06225672><a href="javascript:;" data-v-06225672>2020-01-05</a></div> <!----></div></div></div> <!----> <div class="content-wrapper"><div class="right-menu-wrapper"><div class="right-menu-margin"><div class="right-menu-title">目录</div> <div class="right-menu-content"></div></div></div> <h1><img src="">上传和下载的进度监控<!----></h1> <!----> <div class="theme-vdoing-content content__default"><h1 id="上传和下载的进度监控"><a href="#上传和下载的进度监控" class="header-anchor">#</a> 上传和下载的进度监控</h1> <h2 id="需求分析"><a href="#需求分析" class="header-anchor">#</a> 需求分析</h2> <p>有些时候，当我们上传文件或者是请求一个大体积数据的时候，希望知道实时的进度，甚至可以基于此做一个进度条的展示。</p> <p>我们希望给 <code>axios</code> 的请求配置提供 <code>onDownloadProgress</code> 和 <code>onUploadProgress</code> 2 个函数属性，用户可以通过这俩函数实现对下载进度和上传进度的监控。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code>axios<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/more/get'</span><span class="token punctuation">,</span><span class="token punctuation">{</span>
  <span class="token function">onDownloadProgress</span><span class="token punctuation">(</span>progressEvent<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 监听下载进度</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

axios<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/more/post'</span><span class="token punctuation">,</span><span class="token punctuation">{</span>
  <span class="token function">onUploadProgress</span><span class="token punctuation">(</span>progressEvent<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// 监听上传进度</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p><code>xhr</code> 对象提供了一个 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/progress_event" target="_blank" rel="noopener noreferrer"><code>progress</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 事件，我们可以监听此事件对数据的下载进度做监控；另外，<a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/upload" target="_blank" rel="noopener noreferrer"><code>xhr.uplaod</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 对象也提供了 <a href="https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/progress_event" target="_blank" rel="noopener noreferrer"><code>progress</code><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a> 事件，我们可以基于此对上传进度做监控。</p> <h2 id="代码实现"><a href="#代码实现" class="header-anchor">#</a> 代码实现</h2> <p>首先修改一下类型定义。</p> <p><code>types/index.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">interface</span> <span class="token class-name">AxiosRequestConfig</span> <span class="token punctuation">{</span>
  <span class="token comment">// ...</span>
  onDownloadProgress<span class="token operator">?</span><span class="token operator">:</span> <span class="token punctuation">(</span>e<span class="token operator">:</span> ProgressEvent<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span>
  onUploadProgress<span class="token operator">?</span><span class="token operator">:</span> <span class="token punctuation">(</span>e<span class="token operator">:</span> ProgressEvent<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token keyword">void</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><p>接着在发送请求前，给 <code>xhr</code> 对象添加属性。</p> <p><code>core/xhr.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> <span class="token punctuation">{</span>
  <span class="token comment">/*...*/</span>
  onDownloadProgress<span class="token punctuation">,</span>
  onUploadProgress
<span class="token punctuation">}</span> <span class="token operator">=</span> config

<span class="token keyword">if</span> <span class="token punctuation">(</span>onDownloadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  request<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onDownloadProgress
<span class="token punctuation">}</span>

<span class="token keyword">if</span> <span class="token punctuation">(</span>onUploadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
  request<span class="token punctuation">.</span>upload<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onUploadProgress
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><p>另外，如果请求的数据是 <code>FormData</code> 类型，我们应该主动删除请求 <code>headers</code> 中的 <code>Content-Type</code> 字段，让浏览器自动根据请求数据设置 <code>Content-Type</code>。比如当我们通过 <code>FormData</code> 上传文件的时候，浏览器会把请求 <code>headers</code> 中的 <code>Content-Type</code> 设置为 <code>multipart/form-data</code>。</p> <p>我们先添加一个判断 <code>FormData</code> 的方法。</p> <p><code>helpers/util.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">function</span> <span class="token function">isFormData</span><span class="token punctuation">(</span>val<span class="token operator">:</span> <span class="token builtin">any</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token builtin">boolean</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token keyword">typeof</span> val <span class="token operator">!==</span> <span class="token string">'undefined'</span> <span class="token operator">&amp;&amp;</span> val <span class="token keyword">instanceof</span> <span class="token class-name">FormData</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>然后再添加相关逻辑。</p> <p><code>core/xhr.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">delete</span> headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><p>我们发现，<code>xhr</code> 函数内部随着需求越来越多，代码也越来越臃肿，我们可以把逻辑梳理一下，把内部代码做一层封装优化。</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">export</span> <span class="token keyword">default</span> <span class="token keyword">function</span> <span class="token function">xhr</span><span class="token punctuation">(</span>config<span class="token operator">:</span> AxiosRequestConfig<span class="token punctuation">)</span><span class="token operator">:</span> AxiosPromise <span class="token punctuation">{</span>
  <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name"><span class="token builtin">Promise</span></span><span class="token punctuation">(</span><span class="token punctuation">(</span>resolve<span class="token punctuation">,</span> reject<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> <span class="token punctuation">{</span>
      data <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">,</span>
      url<span class="token punctuation">,</span>
      method <span class="token operator">=</span> <span class="token string">'get'</span><span class="token punctuation">,</span>
      headers<span class="token punctuation">,</span>
      responseType<span class="token punctuation">,</span>
      timeout<span class="token punctuation">,</span>
      cancelToken<span class="token punctuation">,</span>
      withCredentials<span class="token punctuation">,</span>
      xsrfCookieName<span class="token punctuation">,</span>
      xsrfHeaderName<span class="token punctuation">,</span>
      onDownloadProgress<span class="token punctuation">,</span>
      onUploadProgress
    <span class="token punctuation">}</span> <span class="token operator">=</span> config

    <span class="token keyword">const</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">XMLHttpRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

    request<span class="token punctuation">.</span><span class="token function">open</span><span class="token punctuation">(</span>method<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> url<span class="token operator">!</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>

    <span class="token function">configureRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

    <span class="token function">addEvents</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

    <span class="token function">processHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

    <span class="token function">processCancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

    request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span>

    <span class="token keyword">function</span> <span class="token function">configureRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>responseType<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        request<span class="token punctuation">.</span>responseType <span class="token operator">=</span> responseType
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span>timeout<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        request<span class="token punctuation">.</span>timeout <span class="token operator">=</span> timeout
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span>withCredentials<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        request<span class="token punctuation">.</span>withCredentials <span class="token operator">=</span> withCredentials
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">function</span> <span class="token function">addEvents</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
      request<span class="token punctuation">.</span><span class="token function-variable function">onreadystatechange</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleLoad</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>readyState <span class="token operator">!==</span> <span class="token number">4</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">return</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">if</span> <span class="token punctuation">(</span>request<span class="token punctuation">.</span>status <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">return</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">const</span> responseHeaders <span class="token operator">=</span> <span class="token function">parseHeaders</span><span class="token punctuation">(</span>request<span class="token punctuation">.</span><span class="token function">getAllResponseHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
        <span class="token keyword">const</span> responseData <span class="token operator">=</span>
          responseType <span class="token operator">&amp;&amp;</span> responseType <span class="token operator">!==</span> <span class="token string">'text'</span> <span class="token operator">?</span> request<span class="token punctuation">.</span>response <span class="token operator">:</span> request<span class="token punctuation">.</span>responseText
        <span class="token keyword">const</span> response<span class="token operator">:</span> AxiosResponse <span class="token operator">=</span> <span class="token punctuation">{</span>
          data<span class="token operator">:</span> responseData<span class="token punctuation">,</span>
          status<span class="token operator">:</span> request<span class="token punctuation">.</span>status<span class="token punctuation">,</span>
          statusText<span class="token operator">:</span> request<span class="token punctuation">.</span>statusText<span class="token punctuation">,</span>
          headers<span class="token operator">:</span> responseHeaders<span class="token punctuation">,</span>
          config<span class="token punctuation">,</span>
          request
        <span class="token punctuation">}</span>
        <span class="token function">handleResponse</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
      <span class="token punctuation">}</span>

      request<span class="token punctuation">.</span><span class="token function-variable function">onerror</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleError</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">reject</span><span class="token punctuation">(</span><span class="token function">createError</span><span class="token punctuation">(</span><span class="token string">'Network Error'</span><span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> request<span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>

      request<span class="token punctuation">.</span><span class="token function-variable function">ontimeout</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token function">handleTimeout</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">reject</span><span class="token punctuation">(</span>
          <span class="token function">createError</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Timeout of </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>config<span class="token punctuation">.</span>timeout<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> ms exceeded</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span> config<span class="token punctuation">,</span> <span class="token string">'ECONNABORTED'</span><span class="token punctuation">,</span> request<span class="token punctuation">)</span>
        <span class="token punctuation">)</span>
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span>onDownloadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        request<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onDownloadProgress
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span>onUploadProgress<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        request<span class="token punctuation">.</span>upload<span class="token punctuation">.</span>onprogress <span class="token operator">=</span> onUploadProgress
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">function</span> <span class="token function">processHeaders</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isFormData</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">delete</span> headers<span class="token punctuation">[</span><span class="token string">'Content-Type'</span><span class="token punctuation">]</span>
      <span class="token punctuation">}</span>

      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token punctuation">(</span>withCredentials <span class="token operator">||</span> <span class="token function">isURLSameOrigin</span><span class="token punctuation">(</span>url<span class="token operator">!</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> xsrfCookieName<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">const</span> xsrfValue <span class="token operator">=</span> cookie<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span>xsrfCookieName<span class="token punctuation">)</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>xsrfValue<span class="token punctuation">)</span> <span class="token punctuation">{</span>
          headers<span class="token punctuation">[</span>xsrfHeaderName<span class="token operator">!</span><span class="token punctuation">]</span> <span class="token operator">=</span> xsrfValue
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span>

      Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span>headers<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span>name <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>data <span class="token operator">===</span> <span class="token keyword">null</span> <span class="token operator">&amp;&amp;</span> name<span class="token punctuation">.</span><span class="token function">toLowerCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">===</span> <span class="token string">'content-type'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token keyword">delete</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span>
        <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
          request<span class="token punctuation">.</span><span class="token function">setRequestHeader</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> headers<span class="token punctuation">[</span>name<span class="token punctuation">]</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">function</span> <span class="token function">processCancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>cancelToken<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        cancelToken<span class="token punctuation">.</span>promise<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>reason <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          request<span class="token punctuation">.</span><span class="token function">abort</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
          <span class="token function">reject</span><span class="token punctuation">(</span>reason<span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">function</span> <span class="token function">handleResponse</span><span class="token punctuation">(</span>response<span class="token operator">:</span> AxiosResponse<span class="token punctuation">)</span><span class="token operator">:</span> <span class="token keyword">void</span> <span class="token punctuation">{</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>response<span class="token punctuation">.</span>status <span class="token operator">&gt;=</span> <span class="token number">200</span> <span class="token operator">&amp;&amp;</span> response<span class="token punctuation">.</span>status <span class="token operator">&lt;</span> <span class="token number">300</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token function">resolve</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span>
      <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token function">reject</span><span class="token punctuation">(</span>
          <span class="token function">createError</span><span class="token punctuation">(</span>
            <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token string">Request failed with status code </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>response<span class="token punctuation">.</span>status<span class="token interpolation-punctuation punctuation">}</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">,</span>
            config<span class="token punctuation">,</span>
            <span class="token keyword">null</span><span class="token punctuation">,</span>
            request<span class="token punctuation">,</span>
            response
          <span class="token punctuation">)</span>
        <span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br><span class="line-number">99</span><br><span class="line-number">100</span><br><span class="line-number">101</span><br><span class="line-number">102</span><br><span class="line-number">103</span><br><span class="line-number">104</span><br><span class="line-number">105</span><br><span class="line-number">106</span><br><span class="line-number">107</span><br><span class="line-number">108</span><br><span class="line-number">109</span><br><span class="line-number">110</span><br><span class="line-number">111</span><br><span class="line-number">112</span><br><span class="line-number">113</span><br><span class="line-number">114</span><br><span class="line-number">115</span><br><span class="line-number">116</span><br><span class="line-number">117</span><br><span class="line-number">118</span><br><span class="line-number">119</span><br><span class="line-number">120</span><br><span class="line-number">121</span><br><span class="line-number">122</span><br><span class="line-number">123</span><br><span class="line-number">124</span><br><span class="line-number">125</span><br><span class="line-number">126</span><br><span class="line-number">127</span><br><span class="line-number">128</span><br><span class="line-number">129</span><br><span class="line-number">130</span><br><span class="line-number">131</span><br><span class="line-number">132</span><br><span class="line-number">133</span><br><span class="line-number">134</span><br><span class="line-number">135</span><br></div></div><p>我们把整个流程分为 7 步：</p> <ul><li>创建一个 <code>request</code> 实例。</li> <li>执行 <code>request.open</code> 方法初始化。</li> <li>执行 <code>configureRequest</code> 配置 <code>request</code> 对象。</li> <li>执行 <code>addEvents</code> 给 <code>request</code> 添加事件处理函数。</li> <li>执行 <code>processHeaders</code> 处理请求 <code>headers</code>。</li> <li>执行 <code>processCancel</code> 处理请求取消逻辑。</li> <li>执行 <code>request.send</code> 方法发送请求。</li></ul> <p>这样拆分后整个流程就会显得非常清晰，未来我们再去新增需求的时候代码也不会显得越来越臃肿。</p> <h2 id="demo-编写"><a href="#demo-编写" class="header-anchor">#</a> demo 编写</h2> <p>这节课的 demo 非常有意思，我们第一次给界面上增加了一些交互的按钮。</p> <p><code>examples/more/index.html</code></p> <div class="language-html line-numbers-mode"><pre class="language-html"><code><span class="token doctype"><span class="token punctuation">&lt;!</span><span class="token doctype-tag">DOCTYPE</span> <span class="token name">html</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>en<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>head</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>utf-8<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>title</span><span class="token punctuation">&gt;</span></span>More example<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>title</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>link</span> <span class="token attr-name">rel</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>stylesheet<span class="token punctuation">&quot;</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>text/css<span class="token punctuation">&quot;</span></span> <span class="token attr-name">href</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css<span class="token punctuation">&quot;</span></span><span class="token punctuation">/&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>head</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span>file download<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>download<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn btn-primary<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>Download<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>h1</span><span class="token punctuation">&gt;</span></span>file upload<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>h1</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>form</span> <span class="token attr-name">role</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>form<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>form<span class="token punctuation">&quot;</span></span> <span class="token special-attr"><span class="token attr-name">onsubmit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span><span class="token value javascript language-javascript"><span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span></span><span class="token punctuation">&quot;</span></span></span><span class="token punctuation">&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>input</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>file<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>form-control<span class="token punctuation">&quot;</span></span><span class="token punctuation">/&gt;</span></span>
  <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>upload<span class="token punctuation">&quot;</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>button<span class="token punctuation">&quot;</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>btn btn-primary<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span>Upload<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>form</span><span class="token punctuation">&gt;</span></span>

<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>script</span> <span class="token attr-name">src</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">&quot;</span>/__build__/more.js<span class="token punctuation">&quot;</span></span><span class="token punctuation">&gt;</span></span><span class="token script"></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>script</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>body</span><span class="token punctuation">&gt;</span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>html</span><span class="token punctuation">&gt;</span></span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br></div></div><p>另外，我们为了友好地展示上传和下载进度，我们引入了一个开源库 <a href="https://github.com/rstacruz/nprogress" target="_blank" rel="noopener noreferrer">nprogress<span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a>，它可以在页面的顶部展示进度条。</p> <p><code>examples/more/app.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">const</span> instance <span class="token operator">=</span> axios<span class="token punctuation">.</span><span class="token function">create</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

<span class="token keyword">function</span> <span class="token function">calculatePercentage</span><span class="token punctuation">(</span>loaded<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">,</span> total<span class="token operator">:</span> <span class="token builtin">number</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">return</span> Math<span class="token punctuation">.</span><span class="token function">floor</span><span class="token punctuation">(</span>loaded <span class="token operator">*</span> <span class="token number">1.0</span><span class="token punctuation">)</span> <span class="token operator">/</span> total
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">loadProgressBar</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> <span class="token function-variable function">setupStartProgress</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    instance<span class="token punctuation">.</span>interceptors<span class="token punctuation">.</span>request<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>config <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      NProgress<span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token keyword">return</span> config
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>

  <span class="token keyword">const</span> <span class="token function-variable function">setupUpdateProgress</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> <span class="token function-variable function">update</span> <span class="token operator">=</span> <span class="token punctuation">(</span>e<span class="token operator">:</span> ProgressEvent<span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token builtin">console</span><span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span>
      NProgress<span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token function">calculatePercentage</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span>loaded<span class="token punctuation">,</span> e<span class="token punctuation">.</span>total<span class="token punctuation">)</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
    instance<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>onDownloadProgress <span class="token operator">=</span> update
    instance<span class="token punctuation">.</span>defaults<span class="token punctuation">.</span>onUploadProgress <span class="token operator">=</span> update
  <span class="token punctuation">}</span>

  <span class="token keyword">const</span> <span class="token function-variable function">setupStopProgress</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    instance<span class="token punctuation">.</span>interceptors<span class="token punctuation">.</span>response<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span>response <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      NProgress<span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token keyword">return</span> response
    <span class="token punctuation">}</span><span class="token punctuation">,</span> error <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      NProgress<span class="token punctuation">.</span><span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token keyword">return</span> <span class="token builtin">Promise</span><span class="token punctuation">.</span><span class="token function">reject</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span>

  <span class="token function">setupStartProgress</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token function">setupUpdateProgress</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token function">setupStopProgress</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

<span class="token function">loadProgressBar</span><span class="token punctuation">(</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> downloadEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'download'</span><span class="token punctuation">)</span>

downloadEl<span class="token operator">!</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span> e <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  instance<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'https://img.mukewang.com/5cc01a7b0001a33718720632.jpg'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>

<span class="token keyword">const</span> uploadEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'upload'</span><span class="token punctuation">)</span>

uploadEl<span class="token operator">!</span><span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'click'</span><span class="token punctuation">,</span> e <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> data <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FormData</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token keyword">const</span> fileEl <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'file'</span><span class="token punctuation">)</span> <span class="token keyword">as</span> HTMLInputElement
  <span class="token keyword">if</span> <span class="token punctuation">(</span>fileEl<span class="token punctuation">.</span>files<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    data<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span><span class="token string">'file'</span><span class="token punctuation">,</span> fileEl<span class="token punctuation">.</span>files<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span>

    instance<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/more/upload'</span><span class="token punctuation">,</span> data<span class="token punctuation">)</span>
  <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br></div></div><p>对于 <code>progress</code> 事件参数 <code>e</code>，会有 <code>e.total</code> 和 <code>e.loaded</code> 属性，表示进程总体的工作量和已经执行的工作量，我们可以根据这 2 个值算出当前进度，然后通过 <code>Nprogess.set</code> 设置。另外，我们通过配置请求拦截器和响应拦截器执行 <code>NProgress.start()</code> 和 <code>NProgress.done()</code>。</p> <p>我们给下载按钮绑定了一个 <code>click</code> 事件，请求一张图片，我们可以看到实时的进度；另外我们也给上传按钮绑定了一个 <code>click</code> 事件，上传我们选择的文件，同样也能看到实时进度。</p> <p>在服务端，我们为了处理上传请求，需要下载安装一个 <code>express</code> 的中间件 <code>connect-multiparty</code>，然后使用它。</p> <p><code>example/server.js</code>：</p> <div class="language-javascript line-numbers-mode"><pre class="language-javascript"><code><span class="token keyword">const</span> multipart <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">'connect-multiparty'</span><span class="token punctuation">)</span>
app<span class="token punctuation">.</span><span class="token function">use</span><span class="token punctuation">(</span><span class="token function">multipart</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
  <span class="token literal-property property">uploadDir</span><span class="token operator">:</span> path<span class="token punctuation">.</span><span class="token function">resolve</span><span class="token punctuation">(</span>__dirname<span class="token punctuation">,</span> <span class="token string">'upload-file'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span>

router<span class="token punctuation">.</span><span class="token function">post</span><span class="token punctuation">(</span><span class="token string">'/more/upload'</span><span class="token punctuation">,</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">req<span class="token punctuation">,</span> res</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>req<span class="token punctuation">.</span>body<span class="token punctuation">,</span> req<span class="token punctuation">.</span>files<span class="token punctuation">)</span>
  res<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token string">'upload success!'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>这里我们需要在 <code>examples</code> 目录下创建一个 <code>upload-file</code> 的空目录，用于存放上传的文件。</p> <p>通过这个中间件，我们就可以处理上传请求并且可以把上传的文件存储在 <code>upload-file</code> 目录下。</p> <p>为了保证代码正常运行，我们还需要在 <code>examples/webpack.config.js</code> 中添加 <code>css-loader</code> 和 <code>css-loader</code>，不要忘记先安装它们。</p> <p>至此，<code>ts-axios</code> 支持了上传下载进度事件的回调函数的配置，用户可以通过配置这俩函数实现对下载进度和上传进度的监控。下一节课我们来实现 http 的认证授权功能。</p></div></div> <!----> <div class="page-edit"><div class="edit-link"><a href="https://github.com/xugaoyi/vuepress-theme-vdoing/edit/master/docs/《TypeScript 从零实现 axios》/10.ts-axios 更多功能实现/03.上传和下载的进度监控.md" target="_blank" rel="noopener noreferrer">编辑</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----> <!----></div> <div class="page-nav-wapper"><div class="page-nav-centre-wrap"><a href="/vdoing-demo-repository/pages/390cb70e2b619449/" class="page-nav-centre page-nav-centre-prev"><div class="tooltip">XSRF 防御</div></a> <a href="/vdoing-demo-repository/pages/89cd6496c23159ae/" class="page-nav-centre page-nav-centre-next"><div class="tooltip">HTTP 授权</div></a></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/vdoing-demo-repository/pages/390cb70e2b619449/" class="prev">XSRF 防御</a></span> <span class="next"><a href="/vdoing-demo-repository/pages/89cd6496c23159ae/">HTTP 授权</a>→
      </span></p></div></div></div> <!----></main></div> <div class="footer"><!----> 
  Theme by
  <a href="https://github.com/xugaoyi/vuepress-theme-vdoing" target="_blank" title="本站主题">Vdoing</a> 
    | Copyright © 2019-2023
    <span>Evan Xu | MIT License</span></div> <div class="buttons"><div title="返回顶部" class="button blur go-to-top iconfont icon-fanhuidingbu" style="display:none;"></div> <div title="去评论" class="button blur go-to-comment iconfont icon-pinglun" style="display:none;"></div> <div title="主题模式" class="button blur theme-mode-but iconfont icon-zhuti"><ul class="select-box" style="display:none;"><li class="iconfont icon-zidong">
          跟随系统
        </li><li class="iconfont icon-rijianmoshi">
          浅色模式
        </li><li class="iconfont icon-yejianmoshi">
          深色模式
        </li><li class="iconfont icon-yuedu">
          阅读模式
        </li></ul></div></div> <!----> <!----> <!----></div><div class="global-ui"></div></div>
    <script src="/vdoing-demo-repository/assets/js/app.52e6b5d0.js" defer></script><script src="/vdoing-demo-repository/assets/js/2.f10ddeba.js" defer></script><script src="/vdoing-demo-repository/assets/js/158.ad6e937f.js" defer></script>
  </body>
</html>
